focus by chromatic aberration

[P3D Peter Abrahams <telscope@xxxxxxxxxx>]

As a followup to a discussion of a week ago, here is an e-mail I received:

I agree with the general statements below
as well as your hypotheses as well as your respondent's take on which
colors should be more or less in focus.  The general notion of chromatic
aberration as a cue to accommodation is fairly widely accepted and is in
textbooks.  The most current and compelling work (including the effects of
doublets that reverse chromatic aberration) has been done by a fellow named
Phil Kruger at SUNY Schnurmacher Vision Research Institute in Manhattan.
Most of his stuff is published in the journal Optometry and Vision Science.
>the eye uses chromatic aberration to cue the ocular muscles for
>increased or decreased accomodation... 
>other work details how the  eye has difficulty focusing
>in monochromatic light.

>>  - for an object closer than the current focal distance of the eye, the
>>      red is a little bit more blurry (out of focus).
>>  - for an object further than the current focal distance of the eye, the
>>      blue is slightly more blurry.

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  Peter Abrahams    telscope@xxxxxxxxxx
the history of the telescope, the microscope,
   and the prism binocular


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